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Image forming method and toner set for developing electrostatic latent image

a technology of electrostatic latent image and toner set, which is applied in the direction of electrographic process, electrographic process apparatus, instruments, etc., can solve the problems of image quality reduction, achieve the effect of reducing a difference, improving the balance of gloss, and reducing the charge amoun

Active Publication Date: 2020-03-17
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach effectively maintains image quality by balancing gloss between black and color portions and reducing charge differences, thereby improving the overall quality of images during continuous printing.

Problems solved by technology

However, the present inventors found that, in the technique disclosed in Japanese Patent Application Laid-Open No. 2012-234103 (corresponding to US2012 / 288299A1) and Japanese Patent Application Laid-Open No. 2001-117277, there is a problem in that image quality is reduced when printing is continuously performed in large quantities (at the time of continuous printing).

Method used

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  • Image forming method and toner set for developing electrostatic latent image

Examples

Experimental program
Comparison scheme
Effect test

production example 1

alline Polyester Resin Particle Dispersion Liquid (DC1)

[0277]

[0278]250 parts by mass of dodecanedioic acid and 150 parts by mass of 1,9-nonanediol were placed in a reaction vessel equipped with a nitrogen inlet tube, a condenser, a stirrer and a thermometer, and the inside of the reaction vessel was replaced with dry nitrogen gas. Thereafter, 0.5 part by mass of dibutyltin oxide was added as an esterification catalyst. After reacting under stirring at 170° C. for 3 hours under nitrogen gas flow, the temperature was further raised to 210° C. over 1 hour. The inside of the reaction vessel was depressurized to 3 kPa, and the reaction was performed with stirred under reduced pressure for 13 hours, to obtain a crystalline polyester resin (C1).

[0279]The crystalline polyester resin (C1) thus obtained had a number average molecular weight (Mn) of 8,100 and a melting point (Tm) of 69° C.

[0280]

[0281]In a 3 L jacketed reaction tank (BJ-30N, manufactured by TOKYO RIKAKIKAI CO., LTD.) equipped w...

production example 2

Resin Particle Dispersion Liquid (DV1)

[0286]A solution obtained by dissolving 16 parts by mass of sodium dodecylsulfate in 2800 parts by mass of ion-exchanged water was placed in a 5 L reaction vessel equipped with a stirring device, a temperature sensor, a cooling tube, and a nitrogen introducing device, and the internal temperature was raised to 80° C. while stirring at a stirring speed of 230 rpm under a nitrogen stream.

[0287]Next, a solution obtained by dissolving 20 parts by mass of potassium persulfate in 400 parts by mass of ion-exchanged water was added, and the liquid temperature was again brought to 80° C. Thereafter, a vinyl monomer solution consisting of the following raw materials was added dropwise over 1 hour, followed by heating and stirring for 2 hours to conduct polymerization. Thereafter, the solution was cooled to 28° C., whereby aqueous dispersion liquid (DV1) of vinyl resin particles made of a styrene acrylic resin was prepared. The volume-based median diameter...

production example 3

hous Polyester Resin Particle Dispersion Liquid (DA1)

[0293]

[0294]To a reaction vessel equipped with a nitrogen inlet tube, a condenser, a stirrer and a thermometer, 83 parts by mass of terephthalic acid, 66.5 parts by mass of dodecenylsuccinic acid anhydride, and 0.05 parts by mass of dibutyltin oxide as an esterification catalyst were added.

[0295]After reacting at 235° C. for 6 hours under a nitrogen gas stream, the temperature was lowered to 200° C., and 25 parts by mole of fumaric acid, 65 parts by mass of bisphenol A ethylene oxide 2.2-mol adduct, and 285 parts by mass of bisphenol A propylene oxide 2.2-mol adduct were added, and reacted for 1 hour. The temperature was further raised to 220° C. over 4 hours and polymerization was performed under a pressure of 10 kPa until reaching a desired molecular weight to obtain a transparent pale yellow amorphous polyester resin (A1).

[0296]The amorphous polyester resin (A1) thus obtained had a weight average molecular weight (Mw) of 13,000...

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Abstract

In an image forming method, a black toner and a color toner other than the black toner are used. The black toner and the color toner each include a binder resin including a polyester resin as a main component and a vinyl resin, a releasing agent, and an external additive. A content Vk % by mass of the vinyl resin relative to total mass of the binder resin included in the black toner, a content Vc % by mass of the vinyl resin relative to total mass of the binder resin included in the color toner, a content Wk % by mass of the releasing agent relative to the total mass of the binder resin included in the black toner, and a content Wc % by mass of the releasing agent relative to the total mass of the binder resin included in the color toner satisfy a specific relationship.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The entire disclosure of Japanese Patent Application No. 2017-185461, filed on Sep. 26, 2017, is incorporated herein by reference in its entirety.BACKGROUND1. Technological Field[0002]The present invention relates to an image forming method and a toner set for developing an electrostatic latent image.2. Description of Related Art[0003]A color copying machine and a color printer using electrophotographic technology have been widely used. A feature of this technique is that the content of a binder resin is large relative to the total amount of a toner corresponding to printing ink. Specifically, the binder resin is included in an amount of 50% by mass or more, and preferably 80% by mass or more relative to the total amount of the toner. Therefore, when an image is formed on a medium such as paper, film, or the like, by using the toner, gloss according to a surface condition thereof is shown depending on thermal melting characteristic of the ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G03G9/087G03G9/097G03G9/09G03G15/01G03G15/09G03G15/08
CPCG03G9/0918G03G9/091G03G15/0121G03G9/08711G03G9/09725G03G9/08782G03G9/09716G03G9/0904G03G9/09708G03G9/08755G03G15/09G03G15/08
Inventor MATSUSHIMA, KAORIMINE, TOMOKOMOTANI, HITOMI
Owner KONICA MINOLTA INC